Update for ostree init changes
Update for ostree init changes

The archive mode is gone, need to use archive-z2

https://bugzilla.gnome.org/show_bug.cgi?id=706902

GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,GNOME/gnome-ostree,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,chergert/gnome-continuous